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From: "gaius at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug modula2/113730] New: Unexpected handling of mixed-precision
 integer arithmetic
Date: Fri, 02 Feb 2024 22:05:23 +0000
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X-Bugzilla-Product: gcc
X-Bugzilla-Component: modula2
X-Bugzilla-Version: 14.0
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X-Bugzilla-Who: gaius at gcc dot gnu.org
X-Bugzilla-Status: UNCONFIRMED
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X-Bugzilla-Priority: P3
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D113730

            Bug ID: 113730
           Summary: Unexpected handling of mixed-precision integer
                    arithmetic
           Product: gcc
           Version: 14.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: modula2
          Assignee: gaius at gcc dot gnu.org
          Reporter: gaius at gcc dot gnu.org
  Target Milestone: ---

As reported on the gm2 mailing list the compiler incorrectly compiles mixed
precision arithmetic when an expression uses a ZType constant.   It would
appear that the expression is widened to a ZType which is then compatible w=
ith
another fixed sized type.

For example:

VAR
   c32: CARDINAL32 ;
   c64: CARDINAL64 ;
BEGIN
   c32 :=3D 1 ;
   c64 :=3D 2 ;
   c64 :=3D c64 + c32 ;   (* Correctly: fails with incompatible expression.=
  *)
   c64 :=3D c64 * 2 + c32 ;  (* Incorrectly passes!  *)=